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Detonation initiated disintegration of coal particle due to the maxi- mum strain energy theory

Journal of coal Science & Engineering(China) 2013年第4期19卷 435-440页

作者： Patadiya D M Jaisankar S Sheshadri T S Department of Aerospace Engineering Indian Institute of Science Bangalore India

Fragmentation behaviour of coal particles subjected to detonation wave is being studied. Detonation wave is initiated by a plasma cartridge at one end of a detonation tube. coal particles are subjected to a shock whose temperature depends on the Mach number of the detonation wave. Temperature shock is found to generate thermal stresses which may fragment the coal particles. A non-dimensional mathematical model for the heat transfer process in the coal particle is proposed. Thermal stresses are calculated at various times and radii while maximum strain energy theory is used to understand the failure behavior viz., the time, temperature and location of fracture. A physical model for coal particle fragmentation when subjected to detonation wave is also proposed. The study suggests that detonation combustion of coal is qualitatively different from conventional method.

关键词： coal particle detonation wave spontaneous fragmentation

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Influence of pore structure on thermal stress distribution inside coal particles during primary fragmentation

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Particuology 2024年第2期85卷 49-61页

作者： Kai Qiao Shan Zhong Siyang Tang Ke Yang Hairong Yue Kui Ma Lei Song Bin Liang School of Chemical Engineering Sichuan UniversityChengdu610065China Institute of New Energy and Low-carbon Technology Chengdu610207China

Thermal stress is an important reason of coal particle primary fragmentation,during which the role of pore structure is *** stress induced fragmentation experiments were conducted with low volatile coal/char particles,and the results show that the fragmentation severity enhances with increasing *** porous thermal stress models were developed with finite element method,and the influences of the pore shape,size,position and porosity on the thermal stress were *** maximum thermal stress inside particle increases with pore curvature,the pore position affects the thermal stress more significantly at the particle center and *** expectation of the maximum tensile thermal stress linearly increases with porosity,making the particles with higher porosity easier to fragment,contrary to the conclusion deduced from the devolatilization *** obtained results are valuable for the analysis of different thermal processes concerning the thermal stresses of the solid feedstocks.

关键词： coal particle Primary fragmentation Thermal stress Pore structure Porosity

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Effect of chemical conditioning on the triboelectrification of coal and mineral particles

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Mining Science and Technology 2010年第3期20卷 421-424页

作者： WANG Haifeng CHEN Qingru ZHANG Xinxi TAN Zhihai WANG Shuai ZHOU Nianxin Key Laboratory of coal Processing and Efficient Utilization China University of Mining & Technology Xuzhou 221008 China School of Chemical Engineering & Technology China University of Mining & Technology Xuzhou 221116 China

Chemical conditioning was used to modify the triboelectrification of coal and mineral *** chemicals tested included starch,lignin,kerosene,ethanol,acetic acid,salicylic acid,sodium oleate,Sodium Hexametaphosphate(SH),sodium silicate, Sodium Dodecylbenzenesulfonate(SDBS),Sodium Bicarbonate(SB) and ammonia.A high-speed,dry mixing method was *** charge-to-mass ratio of the coal and mineral samples,both untreated and treated,was tested using a Faraday cup. Dielectric constants were determined by measuring *** is found that the selectivity of the additives toward coal or minerals is not *** acid is the optimal additive to enhance the triboelectrification performance of coal ***, lignin and sodium oleate are suitable for removal of ***,sodium silicate,SDBS,SB and ammonia are suitable additives for the removal of ash-forming minerals.

关键词： chemical conditioning triboelectrification coal triboelectrostatic separation coal particle mineral particle

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